PMID- 18816547
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20090128
LR  - 20081013
IS  - 1439-7641 (Electronic)
IS  - 1439-4235 (Linking)
VI  - 9
IP  - 14
DP  - 2008 Oct 6
TI  - Formation mechanism of mesostructured silica in confined space: an in situ GISAXS 
      study.
PG  - 2059-67
LID - 10.1002/cphc.200700589 [doi]
AB  - The structural evolution of periodic mesoporous material within the channels of 
      anodic alumina membranes (AAMs) by evaporation-induced self-assembly (EISA) is 
      investigated by a combination of in situ grazing-incidence small-angle X-ray 
      scattering (GISAXS) with parallel detection of solvent evaporation and ex situ 
      transmission electron microscopy (TEM). Kinetically controlled and 
      equilibrium-controlled structural evolution can be distinguished for these EISA 
      processes. A new mechanism for formation of mesostructures in the confined 
      environment of AAMs is proposed. Data are presented for samples synthesized with 
      nonionic surfactants at various surfactant:silica ratios and relative humidities. 
      The formation of and transformations between circular or columnar 2D hexagonal 
      and tubular lamellar structures are observed. The circular hexagonal phase is 
      kinetically favored over the columnar hexagonal orientation. The TEM images 
      provide evidence that phase transformations, depending on their type, either 
      start preferentially at the channel wall or in the center of the mesostructured 
      fibers.
FAU - Platschek, Barbara
AU  - Platschek B
AD  - Department of Chemistry and Biochemistry, and Center for NanoScience (CeNS), 
      University of Munich (LMU), Butenandtstr. 5-13 (E), 81377 Munich, Germany.
FAU - Kohn, Ralf
AU  - Kohn R
FAU - Doblinger, Markus
AU  - Doblinger M
FAU - Bein, Thomas
AU  - Bein T
LA  - eng
PT  - Journal Article
PL  - Germany
TA  - Chemphyschem
JT  - Chemphyschem : a European journal of chemical physics and physical chemistry
JID - 100954211
EDAT- 2008/09/26 09:00
MHDA- 2008/09/26 09:01
CRDT- 2008/09/26 09:00
PHST- 2008/09/26 09:00 [pubmed]
PHST- 2008/09/26 09:01 [medline]
PHST- 2008/09/26 09:00 [entrez]
AID - 10.1002/cphc.200700589 [doi]
PST - ppublish
SO  - Chemphyschem. 2008 Oct 6;9(14):2059-67. doi: 10.1002/cphc.200700589.